Rotary intaglio-printing machine.



E. MBRTENS.

ROTARY INTAGLIO PRINTING MACHINE.

APPLICATION FILED NAILS. 191 2.

Patented July 14, 1914.-

Amara in STATES Parana OFFIGE.

EDUARDMERTENS, OF FREIBURG, BRCEISGAU, GERMANY, ASSIGNOR F ONE-HALF T0 ELSASSICHE MASCHINENBAU GESELLSCHAFT, 0F.MULHAUSEN, GERMANY.

ROTARY INTAGLIO-PBINTING MACHINE.

Specification of Letters fatent. Patented July 14, 1914.

Application filed March 8, 1912. Serial No. 682,547.

residing at 60 Freiaustrasse, Freiburg, in

Breisgau, in the Grand Duchy of Baden, Germany, have invented a new and useful Improved Rotary Intaglio-Printing Machine, of which the following is a specification.

In numerous printing processes, elastic backing cloths have been employed which were inserted between the pressure cylinder and the material to be printed, in order to soften the imprint. In all printing machines which have hitherto operated with these elastic backing cloths, the backing cloth is first stretched by displacement ofthe pressure cylinder. This method of stretching has the drawback that the formation of creases and a sidewise running ofthe printing cloth is easily occasioned.

The object of the present invention is a device which in the case of intaglio printing, especially of printing of illustrations, serves to maintain the backing cloth invariably in the stretched condition, even previous to the printing, inasmuch as the journals of the tension roller which regulates the tension of the backing cloth, are rigidly connected with the journals of the pressure cylinder by means of a suitable device and permit of being approached to or removed from the printing surface together with the pressure cylinder and the stretched cloth.

As example of the invention, the construction is illustrated as follows:

Figure 1 shows a. diagram elevation of the construction applied to a printing machine. Fig. 2 is a diagram of a modification. Fig. 3 IS a front elevation of the construction shown by Fig. 1 of the drawings.

In these drawings, A indicates the print mg cylinder and B the pressure cylinder of arotary machine. Between them there passes the backing cloth C, the tension of which is regulated by the tension roller D. The position of the tension roller D can be adjustedby means of the screw E in order to increase or diminish the tension up or down. Between the printing cylinder A and the elastic backing cloth (for instance a rubber cloth) C there passes the material to be printed when the impression is to be made thereon directly by the printing cylinder A- The two bars F connect the axle of journal supports of the tension the pressure cylinder B with the axle of the tension roller D so that each movement of the pressure cylinder B, which can be moved up or down bynieans of the screw H, the cone wheels J and the hand wheel K, causes a corresponding movement of the tension roller D and the cloth C. If the printing is not transmitted directly from the printing cylinder A to the material to be printed then the latter receives another course'and the engraved printing cylinder A prints upon the elastic cloth C, which in turn transmits the color received to the paper web shown in Fig. 2. By the two pressing cylinders Land M, the paper web and the cloth are squeezed together and the imprint is effected. In this process it is of course assumed that either the periphery of the cloth amounts to exactly the circumference or a multiple of the circumference of the printing cylinder, or that one of the already known cleaning devices is applied to the cloth, which removes the color left over after the imprint before each new imprint.

By regulating the tension roller 'D, an exact maintenance of the register of the ex tensible cloth can be made even during the operation of the machine.

As backing cloths, rubber bands are most suitable, the great extensibility of which facilitates the aboveindicated register adjustment for indirect printing.

lVhat I claim is:

1. In a rotary intaglio printing machine with elastic backing cloth adapted to operate continuously, comprising a machine frame, a printing cylinder,- a pressure cylinder, a tension roller, mechanism for tensioning and positioning the said cloth with regard to the printing cylinder, comprising bars the pressure cylinder at one end, and to the roller at their other end, a screw adjustment adapted to raise or lower the tension roller ournals in their supports, and screw mechanism adapted .to move the pressure cylinder in the machine frame positively with regard to the printing cylinder, said motion be ng compulsorily participated in by the tension roller.

2. In a rotary intaglio printing machine with elastic impression band, in combination in a printing press frame, the printing cylinder A, the pressure cylinder B, the endless elastic" band 0 adapted to travel between the said cylinders and soften the impact, hand wheel K, cone-gearing J, journal for the cylinder B, journal for the roller D, the threaded shaft H connected to the journal of the cylinder B for the purpose of raising or lowering it, tension roller D having the band C passing over it, mechanism E for independent regulation of the tension roller and bars F rigidly connecting the journal of the cyIinderB with the journal of the roller D so that the motions of the one are compulsorily shared by the other.

In testimony whereof I have signed my 15 name to this specification in the presence of two subscribing witnesses.

'EDUARD MERTEN S."

Witnesses FANNY R. JEWETT, ERWIN SPRAUL. 

